CN206329284U - A kind of dual hermetic seal special buckle oil pipe of metallic elastic - Google Patents

Abstract

The utility model discloses a kind of dual hermetic seal special buckle oil pipe of metallic elastic, described oil pipe body one end sets external screw thread, the other end sets welding groove, external screw thread one end is provided with the oil pipe body, it is additionally provided with body Spherical Seals face, the cusp of the body Spherical Seals face and tube end torque shoulder is apart from L1=29.00mm 29.10mm, the body Spherical Seals face with and its box cupling Spherical Seals face 9 being used in combination be used in combination, the cusp of the box cupling Spherical Seals face and coupling end torque shoulder is apart from L2=28.90mm 29.00mm, and L1 L2≤0.05mm.The utility model ball face sealing can be to realize elastic packing in the range of greater angle, ball face sealing structure can offset external moment of torsion on axial direction, radial direction are multi-direction, overload-resistant moment of torsion effect can be functioned well as, while easy structure is also in industrially promotion and application.

Description

A metal elastic double airtight special buckle oil pipe

technical field

The utility model belongs to the technical field of drilling equipment for oil exploitation, and relates to the oil pipe screw connection technology of the drilling equipment, in particular to a metal elastic double-air-sealed special buckle oil pipe.

Background technique

With the development of social economy and the advancement of science and technology, people are increasingly dependent on petroleum energy. This promotes the development and utilization of deep underground oil and gas resources. Oil casing is an indispensable special pipe in the process of oil and gas drilling, and its quality directly affects the success or failure of drilling operations and the life of oil and gas wells. The threaded joints, together with the oil and casing strings, have been subjected to the test of composite stresses caused by tension, compression, bending, internal pressure, external pressure and temperature for a long time in oil and gas wells. The weakest part of the oil and casing is the threaded connection. The quality is good or bad, directly affects the life of oil and gas wells. According to the survey, about 64% of foreign oil casing failure accidents occurred at the threaded joints, and the domestic rate was as high as 86%.

The API standard oil casing threaded joint is the most commonly used oil casing joint in my country, and it is also the leading product of various oil casing manufacturers in my country. This product has mature technology and is easy to process. However, there are still some inherent defects in the structure of the oil-casing joint, such as unreliable sealing, low torsion resistance, and easy thread sticking, etc., which limit the use of API oil-casing joints.

During the development of the petroleum industry, with the development of oil well gas drilling and production operations towards greater well depth, higher pressure and temperature, and more severe working conditions, and the advancement of oil drilling and production technology itself, the API commonly used for oil special pipes Standard threaded joints have been difficult to meet the development requirements of oilfields. Although the API round thread has relatively good sealing performance, the connection strength of the threaded part is only equivalent to 60% to 80% of the pipe body, and the API partial trapezoidal thread has a high connection strength, but the sealing performance is not ideal. . Therefore, all major oil pipe manufacturers in the world are committed to developing special threaded oil well pipes with superior connection strength and sealing performance.

With the sharp increase in the world's demand for fossil energy and the decrease in the amount of oil that can be recovered year by year, the current oil exploration field is gradually developing in the direction of deep wells, ultra-deep wells, high-pressure oil and gas wells, heavy oil thermal recovery wells, and directional wells. As a result, more and more stringent technical requirements are put forward for the sealing between oil pipes and pipes. The widely used API (American Petroleum Institute) standard round thread and buttress thread joints in the past cannot meet the needs of oil and gas wells with harsh environmental conditions in terms of air tightness, connection strength and torsion resistance. Force people to research and develop the more reliable special thread oil pipe of performance.

Utility model content

The purpose of the utility model is to provide a metal elastic double-air-sealed special buckle oil pipe, improve the structure of the thread and the connection, improve the sealing and torsion resistance, and make it more suitable for oil and gas wells with harsh environmental conditions.

In order to achieve the purpose of the utility model, the utility model provides a metal elastic double-air-sealed special buckle oil pipe, which is characterized in that one end of the oil pipe body 1 is provided with an external thread 2, and the other end is provided with a welding bevel, and the oil pipe One end of the pipe body 1 is provided with an external thread 2, and a spherical sealing surface 3 of the pipe body is also provided. The distance between the spherical sealing surface 3 of the pipe body and the cusp of the torque shoulder 5 at the end of the pipe body is L1 = 29.00mm-29.10mm , the spherical sealing surface 3 of the pipe body is used in conjunction with the spherical sealing surface 9 of the coupling used in conjunction with it, and the distance between the spherical sealing surface 9 of the coupling and the torque shoulder 10 at the coupling end is L2 =28.90mm-29.00mm, and L1-L2≤0.05mm.

Wherein, the circular arc of the spherical sealing surface of the pipe body r=11.50mm-12.00mm, the circular arc of the spherical sealing surface of the collar R=12.00mm-12.50mm, and R-r≥0.20mm.

Wherein, the spherical sealing surface of the pipe body and the spherical sealing surface of the coupling are matched by an elastic arc type metal interference fit, and the interference amount is 0.02-0.20 mm.

Compared with the prior art, the beneficial effect of the utility model is that the spherical seal can realize elastic sealing in a larger angle range compared with the simple cone seal of the prior art, and the spherical seal structure can be axially and radially multi-direction Offset external torque, can well play the role of anti-overload torque, and at the same time, the simple structure is also popularized and applied in the industry.

Description of drawings

Fig. 1 is the structural representation of the utility model.

Fig. 2 is a schematic structural view of the outer threaded end of the pipe of the present invention.

Fig. 3 is a structural schematic diagram of the inner threaded end of the coupling of the utility model.

Fig. 4 is an enlarged schematic view of the thread structure of the present invention.

In the figure, 1-oil pipe body, 2-external thread, 3-spherical sealing surface of the pipe body, 4-tapered sealing surface of the pipe body, 5-torque shoulder at the end of the pipe body, 6-coupling, 7-internal thread , 8-coupling stress relief groove, 9-coupling spherical sealing surface, 10-coupling conical surface sealing surface, 11-coupling end torque shoulder, Q-bearing surface angle, D-guiding surface angle, C- Cone angle of inner boring, P-pitch, G-thread height, circular arc r of the spherical sealing surface of the pipe body, circular arc R of the spherical sealing surface of the coupling.

detailed description

Below in conjunction with accompanying drawing and specific embodiment the utility model is described in further detail. It should be understood that the specific embodiments described here are only used to explain the utility model, and are not intended to limit the utility model.

It should be noted that the "connection" mentioned in this application and the words used to express "connection", such as "connected", "connected", etc., include not only a direct connection between a certain component and another component, but also a certain One part is connected to another part through other parts.

It should be noted that the terminology used here is only for describing specific implementations, and is not intended to limit the exemplary implementations according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should also be understood that when the terms "comprising" and/or "comprising" are used in this specification, it indicates There are features, steps, operations, parts or modules, components and/or combinations thereof.

It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other.

As shown in Figures 1 to 4, the present application provides a metal elastic double-air-sealed special buckle oil pipe, one end of the oil pipe body 1 is provided with an external thread 2, and the other end is provided with a welding bevel. One end with external thread 2 is provided, and the spherical sealing surface 3 of the pipe body is also provided. The distance between the spherical sealing surface 3 of the pipe body and the torque shoulder 5 at the end of the pipe body is L1=29.00mm-29.10mm. The spherical sealing surface 3 is used in conjunction with the spherical sealing surface 9 of the coupling, and the distance between the spherical sealing surface 9 of the coupling and the torque shoulder 10 at the coupling end is L2=28.90mm- 29.00mm, and L1-L2≤0.05mm.

Wherein, the arc r of the spherical sealing surface 3 of the pipe body is 11.50mm-12.00mm, the arc R of the spherical sealing surface 9 of the collar is 12.00mm-12.50mm, and R-r≥0.20mm.

Wherein, the spherical sealing surface 3 of the pipe body cooperates with the spherical sealing surface 9 of the coupling to be an elastic circular metal interference fit, and the interference fit is 0.02-0.20mm.

In addition, the above structure can be used in combination with the description structure, which can achieve twice the result with half the effort.

The tubing body 1 is provided with a pipe body end torque shoulder 5 on the outer side of the upper pipe body spherical sealing surface 3; the inner side of the coupling internal thread 7 provided on the coupling 6 is sequentially provided with a coupling stress relief groove 8, a coupling Spherical sealing surface 9, coupling conical sealing surface 10, coupling end torque shoulder 11.

In this application, the external thread 2 and the internal thread 6 adopt a new partial trapezoidal conical thread, the pitch P of which is set to 6-8 teeth/in, and the crest of the thread is parallel to the pipe generatrix;

In the present application, the bearing surface angle (Q) of the partial trapezoidal conical thread is set to be between 3° and 3.5° clockwise with the vertical surface, and the guide surface angle (D) is set to be 10°-12° Between, the inner boring cone angle (C) is set between 5°-10°, and the thread tooth height G is 1.7mm-1.8mm;

In this application, the tubing body 1 has a nominal outer diameter of 60.32 mm to 73.03 mm.

The above is only a preferred embodiment of the utility model, it should be pointed out that for those of ordinary skill in the art, without departing from the principle of the utility model, some improvements and modifications can also be made, these Improvement and retouching should also be regarded as the protection scope of the present utility model.

Claims (3)

1. a kind of dual hermetic seal special buckle oil pipe of metallic elastic, it is characterised in that described oil pipe body (1) one end sets outer spiral shell Line (2), the other end to set and be provided with external screw thread (2) one end on welding groove, the oil pipe body (1), is additionally provided with body ball-type The cusp of sealing surface (3), the body Spherical Seals face (3) and tube end torque shoulder (5) is apart from L1=29.00mm- 29.10mm, the body Spherical Seals face (3) with and its box cupling Spherical Seals face (9) being used in combination be used in combination, institute The cusp of box cupling Spherical Seals face (9) and coupling end torque shoulder (10) is stated apart from L2=28.90mm-29.00mm, and L1-L2 ≤0.05mm。

2. a kind of dual hermetic seal special buckle oil pipe of metallic elastic according to claim 1, it is characterised in that the body The circular arc r=11.50mm-12.00mm, box cupling Spherical Seals face (9) circular arc R=12.00mm- in Spherical Seals face (3) 12.50mm, and R-r >=0.20mm.

3. a kind of dual hermetic seal special buckle oil pipe of metallic elastic according to claim 1, it is characterised in that body ball-type Sealing surface (3) coordinates with box cupling Spherical Seals face (9) with Elastic Circular arc formula metal interference is combined into, and the magnitude of interference=0.02- 0.20mm。